Enable multi-touch emulation with -gpu on

This CL implements a callback that gets invoked by OpenGLES emulator on it framebuffer
updates. This allows transferring framebuffer changes to the supporting device.

Proper implementation of this new callback also required changes to JPEG compression,
addressing:

1. OpenGLES framebuffer format is RGBA8889, which required implementing line conversion
   for this format.
2. OpenGLES framebuffer is (or at least could be) bottom-up arranged. This requires changes
   to the compressor, so it compresses the FB starting from the bottom, so the resulting
   image is up-bottom.

Change-Id: Icd4efbe4a251c838adfa3518decbfc43a7ef06c8

1 files changed, 6 insertions, 1 deletions

diff --git a/vl-android.c b/vl-android.c
index 67da637..5a41e2d 100644
--- a/vl-android.c
+++ b/vl-android.c
@@ -68,6 +68,7 @@
 #include "android/utils/timezone.h"
 #include "android/snapshot.h"
 #include "android/opengles.h"
+#include "android/multitouch-screen.h"
 #include "targphys.h"
 #include "tcpdump.h"
 
@@ -3877,8 +3878,12 @@ int main(int argc, char **argv, char **envp)
         if (android_hw->hw_gpu_enabled) {
             if (android_initOpenglesEmulation() == 0) {
                 gles_emul = 1;
+                /* Set framebuffer change notification callback when starting
+                 * GLES emulation. Currently only multi-touch emulation is
+                 * interested in FB changes (to transmit them to the device), so
+                 * the callback is set within MT emulation.*/
                 android_startOpenglesRenderer(android_hw->hw_lcd_width, android_hw->hw_lcd_height,
-                                              NULL, NULL);
+                                              multitouch_opengles_fb_update, NULL);
             } else {
                 dwarning("Could not initialize OpenglES emulation, using software renderer.");
             }